:root {
  --bg: #f4f6f9; --card: #fff; --ink: #1b2430; --muted: #64748b;
  --brand: #1d4ed8; --brand-soft: #e8efff; --border: #e2e8f0;
  --verde: #16a34a; --amarillo: #d97706; --rojo: #dc2626;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.55 -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--brand); text-decoration: none; }

.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 230px; background: #101a2e; color: #cdd8ea; padding: 20px 14px;
  display: flex; flex-direction: column; gap: 4px; flex-shrink: 0;
}
.sidebar .brand { color: #fff; font-weight: 700; font-size: 17px; margin-bottom: 18px; }
.sidebar .brand small { display: block; color: #7f93b5; font-weight: 400; font-size: 12px; }
.sidebar a {
  color: #cdd8ea; padding: 9px 12px; border-radius: 8px; display: block; font-weight: 500;
}
.sidebar a:hover { background: #1c2a47; }
.sidebar a.active { background: var(--brand); color: #fff; }
.sidebar .spacer { flex: 1; }
.sidebar .who { font-size: 12px; color: #7f93b5; padding: 8px 12px; }

.main { flex: 1; padding: 26px 32px; max-width: 1200px; }
h1 { font-size: 22px; margin: 0 0 18px; }
h2 { font-size: 16px; margin: 26px 0 10px; }

.cards { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 20px; }
.kpi {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 14px 20px; min-width: 150px;
}
.kpi .num { font-size: 26px; font-weight: 700; }
.kpi .lbl { color: var(--muted); font-size: 12.5px; }

.panel {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px 20px; margin-bottom: 18px;
}
table { border-collapse: collapse; width: 100%; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
tr:last-child td { border-bottom: none; }
td.num, th.num { text-align: right; }

.badge {
  display: inline-block; padding: 2px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 600; color: #fff;
}
.badge.verde { background: var(--verde); }
.badge.amarillo { background: var(--amarillo); }
.badge.rojo { background: var(--rojo); }
.badge.gris { background: var(--muted); }
.ok { color: var(--verde); font-weight: 600; }
.err { color: var(--rojo); font-weight: 600; }

.sem-row { display: flex; align-items: center; gap: 10px; margin: 8px 0; }
.sem-course { width: 130px; font-weight: 600; font-size: 13px; }
.sem-bar { display: flex; height: 22px; border-radius: 6px; overflow: hidden; flex: 1; }
.sem-seg { color: #fff; font-size: 12px; font-weight: 600; text-align: center; line-height: 22px; min-width: 26px; }
.sem-seg.verde { background: var(--verde); }
.sem-seg.amarillo { background: var(--amarillo); }
.sem-seg.rojo { background: var(--rojo); }

label { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 4px; }
input, select, textarea {
  width: 100%; padding: 9px 11px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 14.5px; font-family: inherit; background: #fff;
}
textarea { min-height: 90px; resize: vertical; }
.btn {
  padding: 10px 18px; background: var(--brand); color: #fff; border: 0;
  border-radius: 8px; font-size: 14.5px; font-weight: 600; cursor: pointer;
}
.btn.small { padding: 6px 12px; font-size: 13px; }
.btn.ghost { background: #fff; color: var(--brand); border: 1px solid var(--border); }
.flash {
  background: #e8f7ee; border: 1px solid #b7e4c7; color: #14532d;
  border-radius: 10px; padding: 10px 16px; margin-bottom: 16px; font-weight: 500;
}
details { margin: 10px 0; }
details summary { cursor: pointer; font-weight: 600; padding: 6px 0; }
.inline-form { display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap; }
.inline-form > div { flex: 1; min-width: 140px; }

.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; }
.login-box {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 34px 38px; width: 360px;
}
.login-box h1 { font-size: 20px; }
.login-box label { display: block; font-size: 13px; color: var(--muted); margin: 14px 0 4px; }
.login-box input {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 15px;
}
.login-box button {
  margin-top: 20px; width: 100%; padding: 11px; background: var(--brand); color: #fff;
  border: 0; border-radius: 8px; font-size: 15px; font-weight: 600; cursor: pointer;
}
.error { color: var(--rojo); font-size: 13.5px; margin-top: 12px; }
.muted { color: var(--muted); }